A stone monument is a structure made of stone, typically used to commemorate an event or person. The term can refer to a variety of structures, including a stele (5 letters), which is a tall, upright stone slab with an inscription or relief; a CAIRN (5 letters), which is a pile of stones built as a memorial or landmark; an OBELISK (7 letters), which is a tall, four-sided, tapering monument; a MEGALITH (8 letters), which is a large stone that has been used to construct a structure; a stela (5 letters), which is a stone slab with an inscription or relief; and Mount Rushmore (10 letters), which is a mountain in South Dakota featuring the faces of four U.S. presidents carved into the rock.